CBSE Questions for Class 11 Medical Chemistry Chemical Bonding And Molecular Structure Quiz 8 - MCQExams.com

Covalancy of nitrogen in molecule is:
  • $$1$$
  • $$3$$
  • $$6$$
  • $$4$$
Hybridization of sulphur in $$SF$$$$_{4}$$ molecules are :
  • $$sp$$$$^{3}d^{3}$$
  • $$sp$$$$^{3}$$d
  • $$sp$$$$^{3}d^{2}$$
  • $$dsp$$$$^{2}$$
In $${ PO }_{ 4 }^{ 3- }$$ ion the formal charge on the oxygen atom of P-O bond is:
  • +1
  • -1
  • -0.75
  • +0.75
Which of the following posses two lone pairs of electrons on the cebtral atom and square planar in shape?
(i) $$SF _ 4$$  (ii) $$ XeO _ 4$$ (iii) $$XeF _ 4$$ (iv) $${ ICl }_{ 4 }^{ - }$$
  • I, III
  • III, IV
  • II, IV
  • All
The main factor responsible for weak acidic nature of $$B-F$$ bonds in $$BF_3$$ is:
  • large electronegativity of F
  • three centred two electron bonds in $$BF_3$$
  • $$p \pi$$ - $$d \pi$$ back bonding
  • $$p \pi$$ - $$p \pi$$ back bonding
In which of the following molecule, the central atom is used $$sp^{3}d$$ hybridized orbitals?
  • $$SF$$$$_{4}$$
  • $$NH$$$$_{3}$$
  • $$XeF$$$$_{2}$$
  • $$XeF$$$$_{4}$$
$$H_{2}O$$ is polar but $$BeF_{2}$$ is not. The reason of this is  
  • $$H_{2}O$$ is linear, $$BeF_{2}$$ is angular
  • $$H_{2}O$$ is angular, $$BeF_{2}$$ is linear
  • $$H_{2}O$$ involves hydrogen bonding whereas, $$BeF_{2}$$ does not
  • Electronegativitiy of $$F$$ is greater then that of $$O$$
How many sigma and pi bonds are there in tetracyano ethylene molecule?
  • $$9\sigma $$ and $$9\pi$$
  • $$9\sigma $$ and $$7\pi$$
  • $$5\sigma $$ and $$9\pi$$
  • $$5\sigma $$ and $$7\pi$$
The number of anti-bonding electron pairs in $${O}_2^-$$ molecular ion on the basis of molecular orbital theory is (atomic no. of $$O$$ is $$8$$) :
  • $$5$$
  • $$2$$
  • $$7$$
  • $$6$$
Two $$\pi$$ and half $$\sigma$$ bonds are present in:
  • $$N_2^+$$
  • $$N_2$$
  • $$O_2^+$$
  • $$O_2$$
Identify the incorrect statement : 
  • Electronic theory of valency was presented by kossel and Lewis
  • Covalent bond is chemical bond
  • Hydrogen bond is chemical bond
  • Covalent bond is strong bond
Among $$ KO_2, KAlO_2, CaO_2, CaO_2 and NO_2^+ $$ unpaired electron is present in :
  • $$ NO_2^+ , CaO_2 $$
  • $$ KO_2 and KAlO_2 $$
  • $$ KO_2 only $$
  • $$ CaO_2 only $$
The valency of carbon is four. On what principle it can be explained in a better way?
  • Resonance
  • Hybridization
  • Electron transfer
  • None of the above
The hybridisation of $$S$$ in $$SF_6$$ molecule is
  • $$sp^3$$
  • $$sp^3d^2$$
  • $$sp^3d$$
  • None
Which one of the following compounds has permanent dipoles?  
  • $$CH_4$$
  • $$CO_2$$
  • $$HCl$$
  • $$H_2$$
The dipole moment of $$HBr$$ is $$2.6 \times {10^{ - 30}}cm$$ and the interatomic spacing $$1.41\,A^\circ $$. The percentage of ionic in $$HBr$$ is 
  • $$10.5$$
  • $$13.5$$
  • $$12.5$$
  • $$11.5$$
Which of the following is not $$sp^3$$ hybridise 
  • $$BH_3$$
  • $$BH^-_4$$
  • $$NH_4^+$$
  • $$NH_3$$
The molecule which does not exibit dipole moment is : 
  • $$N{H_3}$$
  • $$CHC{l_3}$$
  • $${H_2}O$$
  • $$CC{l_4}$$
What type of carbon-carbon bonds are present in vanaspati ghee?
  • single bonds
  • double bonds
  • triple bonds
  • none of these
Which of the following compounds has a zero dipole moment? 
Choose the correct option for the following molecule in view of chemical bonding: 
1368774_90b83226c9a345868fc409f553f39e9e.png
  • Non-planar
  • $$\mu \ne 0$$
  • A & B both
  • $$\mu = 0$$
Heat of sublimation of $$Na = x J $$
Ionization energy of $$Na =yJ$$
Bond dissociation energy of $$Cl_2 = a J $$
$$e^-$$ gain enthalpy of $$Cl = -b J$$
Enthalpy of formation of $$NaCl = -c J $$
Then what will be the lattice energy of $$NaCl(s)$$ ?
  • $$b + \left ( x+y+c-\frac{a}{2} \right )$$
  • $$b - \left ( x+y+c-\frac{a}{2} \right )$$
  • $$b - \left ( x+y+c+\frac{a}{2} \right )$$
  • $$b -\frac{a}{2} +x+y+c$$
Number of lone pairs in Xe $$OF_{ 4 }$$ is 
  • 0
  • 1
  • 2
  • 3
Which of the following hydrocarbons has the lowest dipole moment?
  • cis-2-butene
  • 2-butyne
  • I=butyne
  • $$H_2C=CH-C\equiv CH$$
In a polar molecule, the ionic charge is $$4.8\times 10^{-10}$$ e.s.u. If the inter ionic distance is one $$\overset {\circ}{A}$$ unit, then the dipole moment is
  • $$41.8\ debye$$
  • $$4.18\ debye$$
  • $$4.8\ debye$$
  • $$0.48\ debye$$
What is the proportion of sigma $$(\sigma)$$, and pi $$(\pi)$$ bond in $$1, 4- Benzoquinone$$?
  • $$1 : 3$$
  • $$3 :2$$
  • $$2 : 1$$
  • $$2 : 3$$
Which of the following elements can show covalencey greater than 4?
  • Be
  • Li
  • P
  • B
The dipole moment of a given compound is .............than that of cyclohexyl chloride.
Choose the most appropriate word fill the blank is more
1402518_e632a22f9e1848b09935cec88fae7500.png
  • more
  • lower
  • same
  • may be more of lower depends upon
The molecule with the highest dipole moment is
  • $$CH_{2}Cl_{2}$$
  • $$CH_{3}Cl$$
  • $$CHCl_{3}$$
  • $$CCl_{4}$$
Which of the following name is incorrectly matched ? 
  • $$H_{2}O$$ - dihydrogen monoxide
  • $$SO_{2}$$ - sulphur dioxide
  • $$HOCl$$- chlorous acid
  • $$H_{3}PO_{3}$$ - phosphorous acid
The correct order of dipole moment is 
  • $${ CH }_{ 4 }<{ NF }_{ 3 }<{ NH }_{ 3 }<{ H }_{ 2 }O$$
  • $${ NF }_{ 3 }<{ CH }_{ 4 }<{ NH }_{ 3 }<{ H }_{ 2 }O$$
  • $${ NH }_{ 3 }<{ NF }_{ 3 }<{ CH }_{ 4 }<{ H }_{ 2 }O$$
  • $${ H }_{ 2 }O<{ NH }_{ 3 }<{ NF }_{ 3 }<{ CH }_{ 4 }$$
The number of ion pairs formed from one mole of $$Ca{(OH)}_{2}$$ are 
  • $$3$$ mol ion
  • $$2$$ mol ion
  • $$1$$ mol ion
  • $$4$$ mol ion
The atomic weight of an element is double its atomic number. If there are four electrons in $$2p$$ orbital, the element is:
  • $$C$$
  • $$N$$
  • $$O$$
  • $$Ca$$
Which of the following molecule have both $$ P \pi - p \pi $$ and $$ p \pi -d \pi $$ bonding?
  • $$ CIO^+_ 2 $$
  • $$ NO^+_2 $$
  • $$ SO^{2-}_3 $$
  • $$ CIO^-_4 $$
The number of $$\sigma$$ bonds and $$\pi$$ bonds in the following structure respectively are:-

1536156_a3f59279c0f34ff1a750605fdc45a4a2.png
  • $$8,5$$
  • $$8,6$$
  • $$3,8$$
  • $$5,13$$
Dipole-dipole interaction possible ONLY if the molecules interacting are ______
  • non-polar with zero dipole moment
  • polar with permanent non-zero dipole moment
  • non-polar with induced dipole moment
  • ionic
Which of the following exhibit minimum number of oxidation states :
  • Mn
  • Np
  • Th
  • Cr
In which of the following shape is same but hybridization is different :
  • $$ICl_2^-, XeF_2$$
  • $$SO_2, NO_2^+$$
  • $$SO_2, NH_2^-$$
  • $$CO_2, SO_2$$
% s-character of N-H bond is maximum in :
  • $$N_2H_2$$
  • $$N_2H_4$$
  • $$NH_3$$
  • $$NH_4^+$$
Which of the following is the correct order of radius?
  • $$H^{-} > H > H^{+}$$
  • $$Na^{+} > F^{-} > O^{2-}$$
  • $$F^{-} > O^{2-} > Na^{+}$$
  • $$Al^{3+} > Mg^{2+} > N^{3-}$$
The major binding force in graphite is 
  • ionic bond
  • covalent bond
  • hydrogen bond
  • London force
Solid $$CO_{2}$$ form:
  • Ionic bond
  • Van der Waal's bond
  • Chemical bond
  • Covalent bond
Consider the following species:
(i) $$[O_2]^{2-}$$
(ii) $$[CO]^+$$
(iii) $$[O_2]^+$$
Among these sigma bond alone is present in?
  • (i) alone
  • (ii) alone
  • (iii) alone
  • (i) and (ii)
  • (i), (ii) and (iii)
_______ bond is the most polar.
  • $$C-O$$
  • $$C-Br$$
  • $$C-S$$
  • $$C-F$$
Allyl cyanide contains _____ $$\sigma$$ and ____ $$\pi$$-bonds.
  • $$5\sigma, 7\pi$$
  • $$9\sigma, 3\pi$$
  • $$3\sigma, 4\pi$$
  • $$9\sigma, 9\pi$$
In which different forms does nitrogen exist in compounds?
$$1$$. bonded by a triple covalent bond
$$2$$. as part of a cation
$$3$$ in a oxidation state of $$+5$$.
  • $$1, 2$$ and $$3$$ are correct
  • $$1$$ and $$2$$ only are correct
  • $$2$$ and $$3$$ only are correct
  • $$1$$ only is correct
The hybrid states of carbon atoms in $${(\overset{B}CN)_4}\overset{A}{C_2}$$ are A and B and number of $$\pi$$ bonds in compound is C. Then?
  • $$A=sp, B=sp^2$$ and $$C=9$$
  • $$A=sp^2, B=sp$$, and $$C=9$$
  • $$A=sp^3, B=sp$$ and $$C=9$$
  • $$A=sp^2, B=sp^2$$ and $$C=9$$
In the hydrocarbon, $$H_3\underset{6}{C}-\underset{5}{C}H=\underset{4}{C}H-\underset{3}{C}H_2-\underset{2}{C}\equiv \underset{1}{C}H$$

The state of hybridization of carbons $$1, 3, 5$$ are in the following sequence is:
  • $$sp, sp^2, sp^3$$
  • $$sp^3, sp^2, sp$$
  • $$sp^2, sp, sp^3$$
  • $$sp, sp^3, sp^2$$
Conjugated double bond is present in_______
  • Propylene
  • Isobutylene
  • Butylene
  • Butadiene
Order of arrangement of the following compounds with increasing dipole moment is?
1717812_db18706514e04b16a5e7c0d99a425b41.PNG
  • (i) $$<$$ (iv) $$<$$ (ii) $$<$$ (iii)
  • (iv) $$<$$ (i) $$<$$ (ii) $$<$$ (iii)
  • (iv) $$<$$ (i) $$<$$ (iii) $$<$$ (ii)
  • (iv) $$<$$ (ii) $$<$$ (i) $$<$$ (iii)
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